HPCC-30468 Use service hostname for external dafilesrv if available #6317

Job	Run time
Check Skip	6s
Build Docker (ubuntu-23.04, pull_request)	55m 54s
Build Bare Metal (ubuntu-20.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	4s
Build Docker (ubuntu-22.04, k8s, true, schedule)	1m 39s
Build Bare Metal (ubuntu-22.04, mono, sudo, -DCMAKE_BUILD_TYPE=RelWithDebInfo -DINCLUDE_PLUGINS=O...	34m 54s
Build Docker (ubuntu-22.04, schedule)	1m 18s
Build Bare Metal (windows-2019, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	5s
Build Docker (ubuntu-20.04, schedule)	16s
Build Bare Metal (windows-2022, -T host=x64 -A x64 -DUSE_OPTIONAL=OFF -DCLIENTTOOLS_ONLY=ON -DUSE...	24m 56s
Build Docker (centos-8, schedule)	1m 11s
Build Bare Metal (macos-11, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	4s
Build Docker (centos-7, pull_request, -DVCPKG_TARGET_TRIPLET=x64-centos-7-dynamic)	54m 36s
Build Bare Metal (macos-12, mono, sudo, -DCMAKE_BUILD_TYPE=Release -DUSE_OPTIONAL=OFF -DCLIENTTOO...	19m 14s
Build Docker (amazonlinux, schedule, -DVCPKG_TARGET_TRIPLET=x64-amazonlinux-dynamic)	11s
Build Docker (centos-7, LN, -DVCPKG_TARGET_TRIPLET=x64-centos-7-dynamic, true, schedule)	1m 7s
	3h 15m 35s

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